com.granita.icloudcalsync.DateUtils.java Source code

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Here is the source code for com.granita.icloudcalsync.DateUtils.java

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/*
 * Copyright  2013  2015 Ricki Hirner (bitfire web engineering).
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 */

package com.granita.icloudcalsync;

import android.text.format.Time;
import android.util.Log;

import net.fortuna.ical4j.model.DefaultTimeZoneRegistryFactory;
import net.fortuna.ical4j.model.TimeZone;
import net.fortuna.ical4j.model.TimeZoneRegistry;

import org.apache.commons.lang.StringUtils;

import java.util.SimpleTimeZone;

public class DateUtils {
    private final static String TAG = "DateUtils";

    private final static TimeZoneRegistry tzRegistry = new DefaultTimeZoneRegistryFactory().createRegistry();

    public static String findAndroidTimezoneID(String tzID) {
        String localTZ = null;
        String availableTZs[] = SimpleTimeZone.getAvailableIDs();

        // first, try to find an exact match (case insensitive)
        for (String availableTZ : availableTZs)
            if (availableTZ.equalsIgnoreCase(tzID)) {
                localTZ = availableTZ;
                break;
            }

        // if that doesn't work, try to find something else that matches
        if (localTZ == null) {
            Log.w(TAG, "Coulnd't find time zone with matching identifiers, trying to guess");
            for (String availableTZ : availableTZs)
                if (StringUtils.indexOfIgnoreCase(tzID, availableTZ) != -1) {
                    localTZ = availableTZ;
                    break;
                }
        }

        // if that doesn't work, use UTC as fallback
        if (localTZ == null) {
            Log.e(TAG, "Couldn't identify time zone, using UTC as fallback");
            localTZ = Time.TIMEZONE_UTC;
        }

        Log.d(TAG, "Assuming time zone " + localTZ + " for " + tzID);
        return localTZ;
    }

    public static TimeZone getTimeZone(String tzID) {
        return tzRegistry.getTimeZone(tzID);
    }

}